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https://www.readbyqxmd.com/read/29350110/construct-validity-of-the-resistance-training-skills-battery-in-children-aged-7-10-years
#1
Michael J Duncan, Chelsey Lawson, Josh Hurst, Jason Tallis, Victoria Jones, Emma L J Eyre
The current study sought to examine the construct validity of the Resistance Training Skills Battery for Children (RTSBc), a movement screen purported to assess resistance training skill in children. Children aged 7-10 years (n = 27, 21 males, 6 females) undertook measures of resistance training skill via the RTSBc, motor competence and muscular fitness. Using a median split for RTSBc scores, children were categorised as high or low resistance training competence. Univariate ANCOVAs, controlling for maturation, were used to examine whether measures of muscular fitness and motor competence scores differed as a function of RTSBc competence...
January 19, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29347214/quantum-hamiltonian-daemons-unitary-analogs-of-combustion-engines
#2
Eike P Thesing, Lukas Gilz, James R Anglin
Hamiltonian daemons have recently been defined classically as small, closed Hamiltonian systems which can exhibit secular energy transfer from high-frequency to low-frequency degrees of freedom (steady downconversion), analogous to the steady transfer of energy in a combustion engine from the high terahertz frequencies of molecular excitations to the low kilohertz frequencies of piston motion [L. Gilz, E. P. Thesing, and J. R. Anglin, Phys. Rev. E 94, 042127 (2016)2470-004510.1103/PhysRevE.94.042127]. Classical daemons achieve downconversion within a small, closed system by exploiting nonlinear resonances; the adiabatic theorem permits their operation but imposes nontrivial limitations on their efficiency...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347028/continuous-time-random-walk-model-for-anomalous-diffusion-in-expanding-media
#3
F Le Vot, E Abad, S B Yuste
Expanding media are typical in many different fields, e.g., in biology and cosmology. In general, a medium expansion (contraction) brings about dramatic changes in the behavior of diffusive transport properties such as the set of positional moments and the Green's function. Here, we focus on the characterization of such effects when the diffusion process is described by the continuous-time random-walk (CTRW) model. As is well known, when the medium is static this model yields anomalous diffusion for a proper choice of the probability density function (pdf) for the jump length and the waiting time, but the behavior may change drastically if a medium expansion is superimposed on the intrinsic random motion of the diffusing particle...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29341635/low-field-triggered-large-magnetostriction-in-iron-palladium-strain-glass-alloys
#4
Shuai Ren, Dezhen Xue, Yuanchao Ji, Xiaolian Liu, Sen Yang, Xiaobing Ren
Development of miniaturized magnetostriction-associated devices requires low-field-triggered large magnetostriction. In this study, we acquired a large magnetostriction (800 ppm) triggered by a low saturation field (0.8 kOe) in iron-palladium (Fe-Pd) alloys. Magnetostriction enhancement jumping from 340 to 800 ppm was obtained with a slight increase in Pd concentration from 31.3 to 32.3 at. %. Further analysis showed that such a slight increase led to suppression of the long-range ordered martensitic phase and resulted in a frozen short-range ordered strain glass state...
September 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29338015/exercise-induced-circulating-microrna-changes-in-athletes-in-various-training-scenarios
#5
Martin Horak, Filip Zlamal, Robert Iliev, Jan Kucera, Jan Cacek, Lenka Svobodova, Zuzana Hlavonova, Tomas Kalina, Ondrej Slaby, Julie Bienertova-Vasku
BACKGROUND: The aim of the study was to compare selected extracellular miRNA levels (miR-16, miR-21, miR-93 and miR-222 with the response to 8-week-long explosive strength training (EXPL), hypertrophic strength training (HYP) and high-intensity interval training (HIIT). METHODS: 30 young male athletes of white European origin (mean age: 22.5 ± 4.06 years) recruited at the Faculty of Sports Studies of Masaryk University were enrolled in this study. The study participants were randomly assigned to three possible training scenarios: EXPL, HYP or HITT and participated in 8-week-long program in given arm...
2018: PloS One
https://www.readbyqxmd.com/read/29337833/effects-of-plyometric-and-resistance-training-on-muscle-strength-explosiveness-and-neuromuscular-function-in-young-adolescent-soccer-players
#6
Brandon John McKinlay, Phillip Wallace, Raffy Dotan, Devon Long, Craig Tokuno, David Gabriel, Bareket Falk
This study examined the effect of 8-weeks of free-weight-resistance (RT) and plyometric (PLYO) training on maximal strength, explosiveness and jump performance compared with no added training (CON), in young male soccer players. Forty-one 11[FIGURE DASH]13-year-old soccer players were divided into three groups (RT, PLYO, CON). All participants completed isometric and dynamic (240°/s) knee extensions pre- and post-training. Peak torque (pT), peak rate of torque development (pRTD), electromechanical-delay (EMD), rate of muscle activation (Q50), m...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29325192/single-transsacral-screw-and-nut-stabilization-of-bilateral-sacroiliac-luxation-in-20-cats
#7
Andrea Pratesi, James M Grierson, Andrew P Moores
OBJECTIVE:  This article aims to describe the use of a single transsacral screw and nut in a cohort of cats with bilateral sacroiliac (SI) luxation and document its radiographic and clinical outcome. METHODS:  Medical records and radiographic studies of cats with bilateral SI luxation managed with a transsacral screw and nut stabilization were reviewed. Short-term follow-up included clinical examination and radiographs. Long-term follow-up was via owner questionnaire...
January 2018: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/29320925/self-perceived-and-actual-motor-competence-in-young-british-children
#8
Michael J Duncan, Victoria Jones, Wesley O'Brien, Lisa M Barnett, Emma L J Eyre
Children's perception of their own motor competence is an important correlate of their actual motor competence. The current study is the first to examine this association in British children and the first to use both product and process measures of actual motor competence. A total of 258 children (139 boys and 119 girls; aged 4 to 7 years, Mean = 5.6, SD = .96) completed measures of self-perceived motor competence using the Pictorial Scale for Perceived Movement Competence in Young Children. Children were classified as "Low," "Medium," or "High" perceived competence based on tertile analysis...
January 1, 2018: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/29273774/magnetization-jump-in-one-dimensional-j%C3%A2-%C3%A2-q-2-model-with-anisotropic-exchange
#9
Bin-Bin Mao, Chen Cheng, Fu-Zhou Chen, Hong-Gang Luo
We investigate the adiabatic magnetization process of the one-dimensional J - Q 2 model with XXZ anisotropy g in an external magnetic field h by using density matrix renormalization group (DMRG) method. According to the characteristic of the magnetization curves, we draw a magnetization phase diagram consisting of four phases. For a fixed nonzero pair coupling Q, (i) when g < -1, the ground state is always ferromagnetic in spite of h; (ii) when g > -1 but still small, the whole magnetization curve is continuous and smooth; (iii) if further increasing g, there is a macroscopic magnetization jump from partially- to fully-polarized state; (iv) for a sufficiently large g, the magnetization jump is from non- to fully-polarized state...
December 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29241099/perceptual-motor-regulation-in-locomotor-pointing-while-approaching-a-curb
#10
Steven van Andel, Michael H Cole, Gert-Jan Pepping
Locomotor pointing is a task that has been the focus of research in the context of sport (e.g. long jumping and cricket) as well as normal walking. Collectively, these studies have produced a broad understanding of locomotor pointing, but generalizability has been limited to laboratory type tasks and/or tasks with high spatial demands. The current study aimed to generalize previous findings in locomotor pointing to the common daily task of approaching and stepping on to a curb. Sixteen people completed 33 repetitions of a task that required them to walk up to and step onto a curb...
December 9, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29220045/molecular-dynamics-studies-of-irradiation-effects-on-hydrogen-isotope-diffusion-through-nickel-crystals-and-grain-boundaries
#11
X W Zhou, R Dingreville, R A Karnesky
Experiments indicated that tritium permeation in 316 austenitic stainless steel is enhanced by a factor of ∼2-5 after irradiation as compared to the ex-reactor results. To understand this enhancement, we have performed extensive molecular dynamics simulations to study the effects of both the grain boundary structure (Σ3{111}, Σ5{100} and Σ11{311}) and the nature of point defects (vacancy, interstitial, and Frenkel pair) on hydrogen diffusivities in an exemplar fcc metal (nickel). By deriving diffusivities from mean square displacement, all possible atomic jump paths encountered during real diffusion are realistically sampled...
December 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29210956/motor-skills-of-obese-and-severely-obese-children-and-adolescents-a-circuit-study
#12
Anna-Luisa Häcker, Jean-Luc Bigras, Mélanie Henderson, Tracie A Barnett, Marie-Eve Mathieu
During childhood, excessive weight is negatively associated with the development of motor skills, with children with overweight or obesity having poorer motor skills compared to children with normal weight. The objectives of the current study are to identify the differences in motor skills between children and adolescent with obesity and severe obesity and the extent of this difference. To do so, we examined cross-sectionally 165 subjects. Physical fitness was analyzed in both participants with obesity (>97-99...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29204319/reference-standards-to-assess-physical-fitness-of-children-and-adolescents-of-brazil-an-approach-to-the-students-of-the-lake-itaip%C3%A3%C2%BA-region-brazil
#13
Edilson Hobold, Vitor Pires-Lopes, Rossana Gómez-Campos, Miguel de Arruda, Cynthia Lee Andruske, Jaime Pacheco-Carrillo, Marco Antonio Cossio-Bolaños
Background: The importance of assessing body fat variables and physical fitness tests plays an important role in monitoring the level of activity and physical fitness of the general population. The objective of this study was to develop reference norms to evaluate the physical fitness aptitudes of children and adolescents based on age and sex from the lake region of Itaipú, Brazil. Methods: A descriptive cross-sectional study was carried out with 5,962 students (2,938 males and 3,024 females) with an age range of 6...
2017: PeerJ
https://www.readbyqxmd.com/read/29189583/modeling-fitness-variable-responses-to-training-in-prepubescent-children
#14
Ana R Alves, Carlos Marta, Henrique P Neiva, Célia Nunes, Mikel Izquierdo, Mário C Marques
The aim of this study was to determine strength and oxygen uptake (VO2max) performances according to different training program intervention design with 8-weeks duration in prepubescent children through a multiple linear regression models. Two hundred and forty-five healthy prepubescent children (aged 10.9 ± 0.5 years) were randomly assigned to a specific training program (strength training only - S; aerobic training only - A; intra-session aerobic and strength training - AS; intra-session strength and aerobic training - SA; or concurrent training performed in different sessions - CT) or a control group (no training regimen - C)...
November 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29181252/comparison-of-dry-needling-vs-sham-on-the-performance-of-vertical-jump
#15
William D Bandy, Russell Nelson, Lisa Beamer
Introduction: Dry needling has been reported to decrease pain in subjects having myofascial trigger points, as well as pain in muscle and connective tissue. Objective: The purpose of the study was to compare the effects on the ability to perform a two-legged vertical jump between a group who received one bout of dry needling and a group who received one bout of a sham treatment. Methods: Thirty-five healthy students (19 males, 16 females) were recruited to participate in this study (mean age 22...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29176387/effects-of-plyometric-and-directional-training-on-speed-and-jump-performance-in-elite-youth-soccer-players
#16
Marco Beato, Mattia Bianchi, Giuseppe Coratella, Michele Merlini, Barry Drust
Soccer players perform approximately 1350 activities (every 4-6 s), such as accelerations/decelerations, and changes of direction (COD) during matches. It is well established that COD and plyometric training have a positive impact on fitness parameters in football players. This study analyzed the effect of a complex COD and plyometric protocol (CODJ-G) compared to an isolated COD protocol (COD-G) training on elite football players.A randomized pre-post parallel group trial was used in this study. Twenty-one youth players were enrolled in this study (mean ± SDs; age 17 ± 0...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29171185/low-grade-inflammation-and-muscular-fitness-on-insulin-resistance-in-adolescents-results-from-labmed-physical-activity-study
#17
César A Agostinis-Sobrinho, Robinson Ramírez-Vélez, Antonio García-Hermoso, Carla Moreira, Luís Lopes, José Oliveira-Santos, Sandra Abreu, Jorge Mota, Rute Santos
BACKGROUND: Low muscular fitness (MF) and low-grade inflammation has been linked to insulin resistance (IR). OBJECTIVE: To evaluate the associations between MF and a clustered score of inflammatory biomarkers on IR and to investigate the combined impact of MF and inflammation on IR in adolescents. METHODS: This is a cross-sectional analysis with 529 adolescents (267 girls) aged 12 to 18 years. Pubertal stage, socioeconomic status, adherence to the Mediterranean diet, cardiorespiratory fitness, and waist circumference were assessed...
November 24, 2017: Pediatric Diabetes
https://www.readbyqxmd.com/read/29168957/the-effects-of-introducing-tabata-interval-training-and-stability-exercises-to-school-children-as-a-school-based-intervention-program
#18
Annika Ekström, Anna Hafsteinsson Östenberg, Glenn Björklund, Marie Alricsson
Background Physical activities during leisure time as well as school hours have changed over the past few years, with adolescents being less physically active and adopting a sedentary lifestyle. Objective The overall objective of this mixed-methods study was to evaluate the feasibility of introducing a 4-min Tabata interval training into a lower secondary school context. A further aim was to evaluate the possible effects on: coordination, balance, and strength. Methods The study was conducted as an intervention study with a mixed-method approach...
November 23, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/29167568/elite-long-jumpers-with-below-the-knee-prostheses-approach-the-board-slower-but-take-off-more-effectively-than-non-amputee-athletes
#19
Steffen Willwacher, Johannes Funken, Kai Heinrich, Ralf Müller, Hiroaki Hobara, Alena M Grabowski, Gert-Peter Brüggemann, Wolfgang Potthast
The use of technological aids to improve sport performance ('techno doping') and inclusion of Paralympic athletes in Olympic events are matters of ongoing debate. Recently, a long jumper with a below the knee amputation (BKA) achieved jump distances similar to world-class athletes without amputations, using a carbon fibre running-specific prosthesis (RSP). We show that athletes with BKA utilize a different, more effective take-off technique in the long jump, which provided the best athlete with BKA a performance advantage of at least 0...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158621/loaded-and-unloaded-jump-performance-of-top-level-volleyball-players-from-different-age-categories
#20
Katia Kitamura, Lucas Adriano Pereira, Ronaldo Kobal, Cesar Cavinato Cal Abad, Ronaldo Finotti, Fábio Yuzo Nakamura, Irineu Loturco
The aim of this study was to investigate the differences in loaded and unloaded jump performances between different age categories of top-level volleyball players from the same club. Forty-three volleyball players were divided into four age groups: under-17, under-19, under-21 and professional. Vertical jumping height for squat jump (SJ), countermovement jump (CMJ) and CMJ with arm swing (CMJa) and mean propulsive velocity (MPV) in the loaded jump squat exercise with 40% of the athlete's body mass were compared among the different age categories, considering body mass as a covariate...
September 2017: Biology of Sport
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